1983 300SD won't keep running

OK.I had an injector return line leaking,replaced it...drove around the neighborhood for few minutes and then went back to the house thinking everything is OK but then when I put it in reverse it cut off.Did the same thing twice more...though there was some more air in the system...bled the injectors and primed the hand pump...btw I just instaled the new upgrade pump...since U don't have to screw it does it have to be all the way down?I pumped until it got tight but it's not all the way down...now the car won't even go forward...it crankes up fine (running a little rough) but when I put it in drive and give it a little gas it cuts off immediately...
ANy suggestions and help will be greatly appreciated!
Thansk!

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